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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Glue code for the ISP1760 driver and bus
4 * Currently there is support for
5 * - OpenFirmware
6 * - PCI
7 * - PDEV (generic platform device centralized driver model)
8 *
9 * (c) 2007 Sebastian Siewior <bigeasy@linutronix.de>
10 *
11 */
12
13#include <linux/usb.h>
14#include <linux/io.h>
15#include <linux/module.h>
16#include <linux/of.h>
17#include <linux/platform_device.h>
18#include <linux/slab.h>
19#include <linux/usb/isp1760.h>
20#include <linux/usb/hcd.h>
21
22#include "isp1760-core.h"
23#include "isp1760-regs.h"
24
25#ifdef CONFIG_USB_PCI
26#include <linux/pci.h>
27#endif
28
29#ifdef CONFIG_USB_PCI
30static int isp1761_pci_init(struct pci_dev *dev)
31{
32 resource_size_t mem_start;
33 resource_size_t mem_length;
34 u8 __iomem *iobase;
35 u8 latency, limit;
36 int retry_count;
37 u32 reg_data;
38
39 /* Grab the PLX PCI shared memory of the ISP 1761 we need */
40 mem_start = pci_resource_start(dev, 3);
41 mem_length = pci_resource_len(dev, 3);
42 if (mem_length < 0xffff) {
43 printk(KERN_ERR "memory length for this resource is wrong\n");
44 return -ENOMEM;
45 }
46
47 if (!request_mem_region(mem_start, mem_length, "ISP-PCI")) {
48 printk(KERN_ERR "host controller already in use\n");
49 return -EBUSY;
50 }
51
52 /* map available memory */
53 iobase = ioremap_nocache(mem_start, mem_length);
54 if (!iobase) {
55 printk(KERN_ERR "Error ioremap failed\n");
56 release_mem_region(mem_start, mem_length);
57 return -ENOMEM;
58 }
59
60 /* bad pci latencies can contribute to overruns */
61 pci_read_config_byte(dev, PCI_LATENCY_TIMER, &latency);
62 if (latency) {
63 pci_read_config_byte(dev, PCI_MAX_LAT, &limit);
64 if (limit && limit < latency)
65 pci_write_config_byte(dev, PCI_LATENCY_TIMER, limit);
66 }
67
68 /* Try to check whether we can access Scratch Register of
69 * Host Controller or not. The initial PCI access is retried until
70 * local init for the PCI bridge is completed
71 */
72 retry_count = 20;
73 reg_data = 0;
74 while ((reg_data != 0xFACE) && retry_count) {
75 /*by default host is in 16bit mode, so
76 * io operations at this stage must be 16 bit
77 * */
78 writel(0xface, iobase + HC_SCRATCH_REG);
79 udelay(100);
80 reg_data = readl(iobase + HC_SCRATCH_REG) & 0x0000ffff;
81 retry_count--;
82 }
83
84 iounmap(iobase);
85 release_mem_region(mem_start, mem_length);
86
87 /* Host Controller presence is detected by writing to scratch register
88 * and reading back and checking the contents are same or not
89 */
90 if (reg_data != 0xFACE) {
91 dev_err(&dev->dev, "scratch register mismatch %x\n", reg_data);
92 return -ENOMEM;
93 }
94
95 /* Grab the PLX PCI mem maped port start address we need */
96 mem_start = pci_resource_start(dev, 0);
97 mem_length = pci_resource_len(dev, 0);
98
99 if (!request_mem_region(mem_start, mem_length, "ISP1761 IO MEM")) {
100 printk(KERN_ERR "request region #1\n");
101 return -EBUSY;
102 }
103
104 iobase = ioremap_nocache(mem_start, mem_length);
105 if (!iobase) {
106 printk(KERN_ERR "ioremap #1\n");
107 release_mem_region(mem_start, mem_length);
108 return -ENOMEM;
109 }
110
111 /* configure PLX PCI chip to pass interrupts */
112#define PLX_INT_CSR_REG 0x68
113 reg_data = readl(iobase + PLX_INT_CSR_REG);
114 reg_data |= 0x900;
115 writel(reg_data, iobase + PLX_INT_CSR_REG);
116
117 /* done with PLX IO access */
118 iounmap(iobase);
119 release_mem_region(mem_start, mem_length);
120
121 return 0;
122}
123
124static int isp1761_pci_probe(struct pci_dev *dev,
125 const struct pci_device_id *id)
126{
127 unsigned int devflags = 0;
128 int ret;
129
130 if (!dev->irq)
131 return -ENODEV;
132
133 if (pci_enable_device(dev) < 0)
134 return -ENODEV;
135
136 ret = isp1761_pci_init(dev);
137 if (ret < 0)
138 goto error;
139
140 pci_set_master(dev);
141
142 ret = isp1760_register(&dev->resource[3], dev->irq, 0, &dev->dev,
143 devflags);
144 if (ret < 0)
145 goto error;
146
147 return 0;
148
149error:
150 pci_disable_device(dev);
151 return ret;
152}
153
154static void isp1761_pci_remove(struct pci_dev *dev)
155{
156 isp1760_unregister(&dev->dev);
157
158 pci_disable_device(dev);
159}
160
161static void isp1761_pci_shutdown(struct pci_dev *dev)
162{
163 printk(KERN_ERR "ips1761_pci_shutdown\n");
164}
165
166static const struct pci_device_id isp1760_plx[] = {
167 {
168 .class = PCI_CLASS_BRIDGE_OTHER << 8,
169 .class_mask = ~0,
170 .vendor = PCI_VENDOR_ID_PLX,
171 .device = 0x5406,
172 .subvendor = PCI_VENDOR_ID_PLX,
173 .subdevice = 0x9054,
174 },
175 { }
176};
177MODULE_DEVICE_TABLE(pci, isp1760_plx);
178
179static struct pci_driver isp1761_pci_driver = {
180 .name = "isp1760",
181 .id_table = isp1760_plx,
182 .probe = isp1761_pci_probe,
183 .remove = isp1761_pci_remove,
184 .shutdown = isp1761_pci_shutdown,
185};
186#endif
187
188static int isp1760_plat_probe(struct platform_device *pdev)
189{
190 unsigned long irqflags;
191 unsigned int devflags = 0;
192 struct resource *mem_res;
193 struct resource *irq_res;
194 int ret;
195
196 mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
197
198 irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
199 if (!irq_res) {
200 pr_warn("isp1760: IRQ resource not available\n");
201 return -ENODEV;
202 }
203 irqflags = irq_res->flags & IRQF_TRIGGER_MASK;
204
205 if (IS_ENABLED(CONFIG_OF) && pdev->dev.of_node) {
206 struct device_node *dp = pdev->dev.of_node;
207 u32 bus_width = 0;
208
209 if (of_device_is_compatible(dp, "nxp,usb-isp1761"))
210 devflags |= ISP1760_FLAG_ISP1761;
211
212 /* Some systems wire up only 16 of the 32 data lines */
213 of_property_read_u32(dp, "bus-width", &bus_width);
214 if (bus_width == 16)
215 devflags |= ISP1760_FLAG_BUS_WIDTH_16;
216
217 if (of_property_read_bool(dp, "port1-otg"))
218 devflags |= ISP1760_FLAG_OTG_EN;
219
220 if (of_property_read_bool(dp, "analog-oc"))
221 devflags |= ISP1760_FLAG_ANALOG_OC;
222
223 if (of_property_read_bool(dp, "dack-polarity"))
224 devflags |= ISP1760_FLAG_DACK_POL_HIGH;
225
226 if (of_property_read_bool(dp, "dreq-polarity"))
227 devflags |= ISP1760_FLAG_DREQ_POL_HIGH;
228 } else if (dev_get_platdata(&pdev->dev)) {
229 struct isp1760_platform_data *pdata =
230 dev_get_platdata(&pdev->dev);
231
232 if (pdata->is_isp1761)
233 devflags |= ISP1760_FLAG_ISP1761;
234 if (pdata->bus_width_16)
235 devflags |= ISP1760_FLAG_BUS_WIDTH_16;
236 if (pdata->port1_otg)
237 devflags |= ISP1760_FLAG_OTG_EN;
238 if (pdata->analog_oc)
239 devflags |= ISP1760_FLAG_ANALOG_OC;
240 if (pdata->dack_polarity_high)
241 devflags |= ISP1760_FLAG_DACK_POL_HIGH;
242 if (pdata->dreq_polarity_high)
243 devflags |= ISP1760_FLAG_DREQ_POL_HIGH;
244 }
245
246 ret = isp1760_register(mem_res, irq_res->start, irqflags, &pdev->dev,
247 devflags);
248 if (ret < 0)
249 return ret;
250
251 pr_info("ISP1760 USB device initialised\n");
252 return 0;
253}
254
255static int isp1760_plat_remove(struct platform_device *pdev)
256{
257 isp1760_unregister(&pdev->dev);
258
259 return 0;
260}
261
262#ifdef CONFIG_OF
263static const struct of_device_id isp1760_of_match[] = {
264 { .compatible = "nxp,usb-isp1760", },
265 { .compatible = "nxp,usb-isp1761", },
266 { },
267};
268MODULE_DEVICE_TABLE(of, isp1760_of_match);
269#endif
270
271static struct platform_driver isp1760_plat_driver = {
272 .probe = isp1760_plat_probe,
273 .remove = isp1760_plat_remove,
274 .driver = {
275 .name = "isp1760",
276 .of_match_table = of_match_ptr(isp1760_of_match),
277 },
278};
279
280static int __init isp1760_init(void)
281{
282 int ret, any_ret = -ENODEV;
283
284 isp1760_init_kmem_once();
285
286 ret = platform_driver_register(&isp1760_plat_driver);
287 if (!ret)
288 any_ret = 0;
289#ifdef CONFIG_USB_PCI
290 ret = pci_register_driver(&isp1761_pci_driver);
291 if (!ret)
292 any_ret = 0;
293#endif
294
295 if (any_ret)
296 isp1760_deinit_kmem_cache();
297 return any_ret;
298}
299module_init(isp1760_init);
300
301static void __exit isp1760_exit(void)
302{
303 platform_driver_unregister(&isp1760_plat_driver);
304#ifdef CONFIG_USB_PCI
305 pci_unregister_driver(&isp1761_pci_driver);
306#endif
307 isp1760_deinit_kmem_cache();
308}
309module_exit(isp1760_exit);